XLIIl] 



ABIETINEAB 



153 



bands above and below each pit. Cones usually spherical, reaching 2-5 cm, 

 in length, with 6 smooth or tuberculate valves. In C. Madeayana the cones 

 are pyramidal and have 6 — 8 valves'. 



Widdnngtonia. The adult foliage-shoots bear rather longer leaves in 

 decussate pairs^; the twigs are cyhndrical and not flat as in Thuya. In 

 quickly growing shoots the leaves may be spiral; they have no hypodermal" 



Pig. 702 B. Sequoia gigantea. An unusually large cone. 

 (British Museum; nat. size.) 



layer like that in the leaves of Callitris. Spirally thickened tracheids occasion- 

 ally occur in the wood. The cones, consist of 4 decussate thick and warty 

 valves, each scale bearing 7 — 8 winged seeds. 



ABIETINEAE. Pinus. The needle-hke leaves on short shoots are a 

 striking feature. In P. silvestris and many other species each short shoot 



1 Baker and Smith (10). ^ Rendle (96). 



